Creating a Shared Maildir for use with Courier-IMAP

I have a Redhat Fedora Core 1 server which I have installed qmail, courier-imap , vpopmail and qmailadmin as my mail solution

I want to be able to have shared folders aswell so multiple mail accounts can share information between themselve when connecting via IMAP

1. Create a shareable maildir
   /usr/lib/courier-imap/bin/maildirmake -S /opt/Maildir-shared
2. Create a shareable folder with the correct permissions
   /usr/lib/courier-imap/bin/maildirmake -s write -f test-shared /opt/Maildir-shared/
3. Add the shareable folder to the users mailbox
   maildirmake --add test_shared=/opt/Maildir-shared /home/vpopmail/domains/jamesmcdonald.id.au/james/Maildir